Your vehicle has an IAC (Idle Air Control ) valve. When it opens or closes it increases or decreases the amount of air it lets into the throttle body. By changing the air flow, it controls the idle speed. Yours sounds like it may not be reacting.

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By Zach Bowman
For those who suffer a daily commute through heavy traffic, your vehicle's braking system can bring thousands of pounds of metal, plastic and empty Starbucks cups to a stop hundreds of times before you get to work. It goes without saying that these pieces wear out, but they do so slowly, meaning you may not notice they need attention until ...